This great graphic shows what percent of each U.S. state's economy is agricultural.
The old fashioned use of pigs to dig up weeds and fertilize the soil is a pretty good system, after all.
This subject never gets enough attention, that of pesticide drift hitting organic farms - though the drift anywhere should concern us because the chemicals used are very potent.
The article titled "Will the world ever boom again?" credits rural exodus time periods as the one (and perhaps only) big opportunity in which nations are able to boom economically.